If you're buying all
of your check valves from the O.E.M., you're paying too much! Services
for Plastics, Inc. check valves are made from significantly higher quality
tool steels than available through the O.E.M. Along with better quality,
SFP provides customized designing of the screw tip assembly to
successfully work with your brand of molding machine and type of
application. And SFP offers them at significantly lower prices than
the O.E.M. can offer. SFP check valves are the BEST
VALUE in the industry!

We stock a wide variety of brands,, plus we also can
manufacture any screw tip assembly. Using your sample tip assembly, your
print or a print from our extensive library, we will manufacture a screw
tip assembly to match your specific requirements. Services
for Plastics, Inc. check valves are available in a wide variety of tool steels to match your
application.

The following brands of tip assemblies are in
stock and ready to ship.

We have an extensive CAD
library consisting of thousands of prints for screw tips, barrels, screw,
nozzles, end caps, etc. If you need a quote and there isn't a
print available, simply send us a used
sample part and specify what material you want the new one made from. (Hint:
Always
save your original check valves. They are valuable for verification of dimensions
when ordering new assemblies.)

No one check valve design is perfect for every application; therefore, we
offer three distinct designs to ensure the proper component for your application.

H-13 Tool Steel
A good high strength pre-hardened tool steel which is machined, thru-hardened,
and ground dimensionally, then nitride hardened for 72 hours for better wear
resistance. H-13 is tough and can handle pressure and torque.

D-2 Tool Steel
A high carbon/high chrome tool steel with good wear resistance, but low on
torque strength. D-2 should only be used with 4-piece designs where the stud is
manufactured from 4140, H-13 or another high torque steel.

CPM®-420V
Tool Steel
Crucible's CPM®-420V is a new
stainless tool steel best suited for corrosion resistant applications. CPM®-420V
is a higher performance upgrade from CPM®-440V.
Corrosion resistance is significantly better than CPM®-440V.
Wear resistance is about 25-50% better than CPM®-440V,
due to the higher vanadium carbide content of CPM®-420V
(9% vanadium vs. 5.5-6% in CPM®-440V).